STAUROGENIA. 



[ 735 ] 



STENOGRAMME. 



Phyc. 



& 9; 



V. pis. 8 

 N. H. x\-ii. 262; Ralfs,' 

 Brauu, J^erjiinc/ung, Bay 



-A genus of 



arrauged in 



Alg. 437 J Tab 

 Thwaites, Ann. 

 Desmid. p. 146 ; 



Soc. 1853, 287. 



STAUKOGE'NIA, Kutz.- 

 Unicelliilar Algre. 



Char. Cubical, the cells 

 gi'oups of 4, 8, and 16. Propagation by tran 

 quil gonidia arising from repeated division 

 of the cell-substance. -S'. quadratum (PI. 52. 

 fig. 21). In freshwater pools. 



BiBL. Rabenli. Alq. 'in. 80. 



STAURONEIS, Ehr.— A genus of Dia- 

 tomacese; including Staiirostiyma and Stau- 

 roptera. 



Char. Frustules resembling those of iVa- 

 vicida, but the median nodule expanded 

 into a transverse band or stauros. 



Striae resembling those of Naoicula, or 

 intermediate between thosQ oi Navictda and 

 Pinnularia ; often invisible by ordinary 

 illumination. 



The species or forms are numerous. 



S. phoenicentci-on (PI. 15. fig. 43. Valves 

 lanceolate, gradually attenuated towards 

 the somewhat obtuse ends ; stam'os reaching 

 the margins of the valves; strife faint. 

 Freshwater; common; length 1-170" 



S.pidchella (PI. 15. figs. 44,45). Valves 

 oblong, ends obtuse; frustules in front 

 view broadly linear, constricted in the 

 middle, and rounded-truncate at the ends ; 

 sti'iaj distinct ; stauros not reaching the 

 margins. Marine; length 1-70". 



BiBL. Ehrenb. Ber. Berl. Ak. 1843; 

 Kiitz. Bacill. 104, and Spec. Alg. 89 ; Ra- 

 benh. Alg. i. 244. 



STAUROSPER'MUM,Kiitz.=.STArao- 

 CAEPus, Hassall. 



STEARIC ACID.— The crystals of this 

 fatty acid are represented in PL 11. fig. 16. 



STEGANOPOREL'LA,Smitt.— A genus 

 of Polyzoa = Membi^anipora pt. (Hincks, 

 Polyzoa, 176.) 



STEMONI'TIS, Gled.— A genus of 

 Myxomycetes, consisting of little, somewhat 

 stamen-shaped plants, either separate or 



fascicidated, 



on rotten wood, &c. 



They appear at first in the form of a muci- 

 laginous fiocculent expansion (fig. 695), from 

 which the membranaceous peridia grow up 

 (fig. 696). Many of these remain abortive ; 

 others are raised upon stalks, ripen, and, on 

 the separation of the fugacious peridium, 

 display themselves somewhat in the form 

 of Di ACH.s;A,but with a bristle-like columella 

 and no remains of the peridium. The flat, 

 cylindi'ical or globose, reticulated capilli- 



Fig. 695. 



Stemonitis ferruginea. 

 Mycelium overgrowing decaying pine-leaves. 



Fig. 696. 



stemonitis ferruginea. 



Immature (fasciculate) peridia arising from the 



mycelium. 



tium is penetrated partly or through its 

 whole length by a columella continuous 

 with the peduncle ; the spores are inter- 

 spersedin the reticulations of the capiUitium. 

 Capillitium and spores mostly of blackish 

 colour. There are numerous British species ; 

 S. fiisca is common. See Enerthenema 

 and DiACH^A. 



BiBL. Berk. Br. Fl. ii. pt. 2. 317 ; Ann. 

 N. H. i. 257, vi. 431, 2. v. 366 ; Greville, 

 Cnjpt. Flor. pi. 170; Fries, Sum. Veg. 455; 

 Syst. Myc. iii, 156. 



STENHE'LIA, Boeck.— A genus of Co- 

 pepodous Entomostraca. Two species, on 

 Laminaria and in dredgings. (Brady, Copep. 

 ii. 32.) 



_ STENOO'YBE, Nyl.-A genus of para- 

 sitic Micro-lichens fumid on the thallus of 

 Thelotrenia and Graphis = Sphinctrina, 

 Leightou. (Lindsay, Q. Mic. Jn. 1869, 146.) 



STENOGRAM'ME, Ilarv.— A genus of 

 Rliodymeniacese (Florideous Algse), con- 

 taining one very rare British plant, S. in- 

 terrupta, characterized by stalked, flat, fan- 

 shaped fronds, more or less divided dicho- 

 tomously into riband-like lobes, 3-5" high, 

 of a clear pinky-red coloiu'. It is com- 

 posed of a centi'al laj^er of large globular 

 cells, with a kind of rind of small cells. 

 The conceptacles form a sort of sorus or dark 



